111 lines
3.4 KiB
JavaScript
111 lines
3.4 KiB
JavaScript
/*
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This file is part of ethereum.js.
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ethereum.js is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethereum.js is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file providermanager.js
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* @authors:
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* Jeffrey Wilcke <jeff@ethdev.com>
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* Marek Kotewicz <marek@ethdev.com>
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* Marian Oancea <marian@ethdev.com>
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* Gav Wood <g@ethdev.com>
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* @date 2014
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*/
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var web3 = require('./web3'); // jshint ignore:line
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/**
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* Provider manager object prototype
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* It's responsible for passing messages to providers
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* If no provider is set it's responsible for queuing requests
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* It's also responsible for polling the ethereum node for incoming messages
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* Default poll timeout is 12 seconds
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* If we are running ethereum.js inside ethereum browser, there are backend based tools responsible for polling,
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* and provider manager polling mechanism is not used
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*/
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var ProviderManager = function() {
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this.polls = [];
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this.provider = undefined;
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this.id = 1;
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var self = this;
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var poll = function () {
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if (self.provider) {
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self.polls.forEach(function (data) {
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data.data._id = self.id;
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self.id++;
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var result = self.provider.send(data.data);
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result = JSON.parse(result);
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// dont call the callback if result is not an array, or empty one
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if (result.error || !(result.result instanceof Array) || result.result.length === 0) {
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return;
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}
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data.callback(result.result);
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});
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}
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setTimeout(poll, 1000);
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};
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poll();
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};
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/// sends outgoing requests
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ProviderManager.prototype.send = function(data) {
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data.args = data.args || [];
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data._id = this.id++;
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if (this.provider === undefined) {
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console.error('provider is not set');
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return null;
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}
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//TODO: handle error here?
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var result = this.provider.send(data);
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result = JSON.parse(result);
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if (result.error) {
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console.log(result.error);
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return null;
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}
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return result.result;
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};
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/// setups provider, which will be used for sending messages
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ProviderManager.prototype.set = function(provider) {
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this.provider = provider;
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};
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/// this method is only used, when we do not have native qt bindings and have to do polling on our own
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/// should be callled, on start watching for eth/shh changes
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ProviderManager.prototype.startPolling = function (data, pollId, callback) {
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this.polls.push({data: data, id: pollId, callback: callback});
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};
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/// should be called to stop polling for certain watch changes
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ProviderManager.prototype.stopPolling = function (pollId) {
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for (var i = this.polls.length; i--;) {
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var poll = this.polls[i];
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if (poll.id === pollId) {
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this.polls.splice(i, 1);
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}
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}
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};
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module.exports = ProviderManager;
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